Sensus divinitatis or Sense of Divinity was posited by John Calvin as the inherent awareness of God which is implanted in every human being.

It is sometimes used to "prove" that atheists don't exist. Anyone who claims to be an atheist is in denial of the God which they "know" to exist; therefore, they are merely angry at or rebelling against God.

Counter-apologetics

Even the Bible contradicts this view. Psalms 14:1 says, "The fool hath said in his heart, There is no God." It seems hard to argue that anyone could say "in his heart" that there is no God while not believing that there is no God. Therefore, the Bible acknowledges that at least some atheists exist (and they are "fools" by Biblical definition).